Tube rating

Tube ratings are the defined input parameters (kVp, mA, exposure) that can be safely used during its operation without causing damage to the x-ray tube itself and unique to each individual x-ray tube model.

When the electron beam strikes the target material in the anode only 1% of the kinetic energy of the electrons is converted into x-rays whilst the rest is converted into thermal energy. Increasing the kVp, mA, or exposure time increases the thermal energy produced per examination. Thermal energy is dissipated in the anode and surrounding x-ray tube. If too much heat is created (or not enough is dissipated), excess residual thermal energy will damage the anode and tube. 

By creating tube ratings the operator can ensure that the parameters set are appropriate for the examination whilst minimising the risk of damage to the x-ray tube. 

 

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Article information

rID: 57577
Section: Physics
Synonyms or Alternate Spellings:
  • Tube ratings
  • Tube-rating

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